A thermal setting method for wind power transmission lines

Abstract

The invention discloses a thermal setting method for an external wind power transmission line. According to the relationship between the temperature of the transmission line wire and the service life and sag, the total abandoned wind power due to the limit of the thermal setting of the transmission line within the expected service life of the transmission line is: The objective function is constrained by the thermal balance of conductors, the loss of tensile strength of transmission lines, and the limit of safety clearance, and constructs an optimal decision-making model for thermal ratings of transmission lines, calculates the current-carrying values ​​of transmission lines at each time period, and compares them with the initial values ​​of thermal ratings , if the carrying current is greater than the initial value of the thermal setting value, then calculate and accumulate the abandoned wind power in this period in the objective function, update the conductor temperature, the loss of the tensile strength of the transmission line, and repeat iteratively until the time objective function of the expected service life of the transmission line is Zero, solve the quantity to be decided. The invention constructs conductor tensile strength loss and sag constraints based on the transmission line operating life and safety clearance requirements, effectively overcomes the conservatism of traditional thermal values, and effectively enhances the ability of the power grid to accept wind power.

Description

technical field [0001] The invention relates to a thermal setting method for an external wind power transmission line. Background technique [0002] In recent years, wind power has developed rapidly due to the advantages of wide distribution of resources, mature technology, and short construction period. The construction of power grids is relatively slow, and insufficient transmission capacity has become one of the important factors restricting the acceptance of wind power in the power grid. [0003] Thermal limitation is the essence of the load capacity of power transmission components. The industry standards of various countries have given the reference value of the maximum allowable temperature (Maximum Permissible Temperature, MPT) for long-term continuous operation of transmission lines (ACSR) as the basis for calculation of thermal values ​​(such as my country's The MPT reference value is 70°C, France is 85°C, Japan is 90°C, etc.). On the basis of a given MPT, the Stat...

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Problems solved by technology

[0008] The current-carrying and temperature of the transmission lines for sending wind power to the outside have strong fluctuations, which makes the accumulation process of the conductor tensile strength loss also fluctuating. In order to highlight, if the relationship between the temperature of the transmission line conductor and the loss of tensile strength can be directly considered, and the sag limit of the transmission line operation can be taken into account, the calculation of the thermal value that can meet the requirements of the safe clearance distance and service life of the transmission line must be realized. It can improve the conservatism of traditional thermal ratings and enhance the ability of the grid to accept wind power

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